Although there are definitely exceptions to the rule, most houses these days are built with the garages attached. This creates an impetus for garage builders and do-it-yourself-ers to search for innovative techniques for creating visual continuity between the house and the garage. You don’t want a whole third of the front of your home to stick out like a sore thumb- you have to have them blend in style and color.
And most builders do pretty well. You can really choose from a lot of options these days- glass or acrylic windows for the garage door, for example, are available to match with the windows in the rest of your house. You can make sure the sill colors are the same, or that the basic lines are similar. Plus, garage doors themselves can be ordered or re-painted in any color combination, with almost any architectural motif.
If you want to get really creative, you can think about perhaps avoiding perfect matching, and instead go with complements. Like the real fashionista who knows exact matches aren’t fashion forward, you may want to go for a garage door style that echoes your home, or maybe has a complementary pallette. Cream where your house is white, and white where it’s cream, for example.